Most property managers will have all people over 21 fill out rental applications and credit authorizations for people who will be living in the home. Unless your boyfriend lies on your application, you will need to declare all people living in the property. If you do lie, it will cause more problems later. You should be 100% honest because if you are accepted, it might actually help your credit and you'll get a good referral/recommendation. If there are valid reasons for your bad credit, you can write a letter of explanation that caused the problems and include it with your application. If you have a stable job with a pay history, that will help too! If you are still having problems qualifying, they may ask for some one to co-sign.